1. The role of bound states in positronium annihilation

   • V. I. Goldanskii
   • V. P. Shantarovich

   Invited Paper Pages: 335 - 351

2. A new pendulum device to measure contact potential differences

   • J. Hölzl
   • P. Schrammen

   Contributed Papers Pages: 353 - 357

3. Experimental study of magnetic forces on normal and null flux coil arrangements in the inductive levitation system

   • H. Hieronymus
   • J. Miericke
   • M. Rudel

   Contributed Papers Pages: 359 - 366

4. A Rb-magnetometer for a wide range and high sensitivity

   • W. Farr
   • E. -W. Otten

   Contributed Papers Pages: 367 - 378

5. Critical considerations of the directional selectivity of holographic high-pass filters for characters with a limited number of feature orientations

   • G. Winzer

   Contributed Papers Pages: 379 - 382

6. Lifetime spectra of positrons in ionic compounds

   • M. Noguchi
   • T. Chiba
   • N. Tsuda

   Contributed Papers Pages: 383 - 385

7. A narrowband jet stream dye laser

   • B. Wellegehausen
   • H. Welling
   • R. Beigang

   Contributed Papers Pages: 387 - 391

8. Positron trapping measurements of high precision using a labelling technique

   • I. K. MacKenzie
   • P. C. Lichtenberger

   Contributed Papers Pages: 393 - 396

9. Observation of the lateral displacement of surface acoustic beams reflected at boundaries of layered substrates

   • A. Gedeon

   Contributed Papers Pages: 397 - 402

10. Surface energy and mechanical behaviour of hardened cement paste

    • M. J. Setzer
    • F. H. Wittmann

    Contributed Papers Pages: 403 - 409

11. Total reflection of a light beam at a dielectric interface: A comparative study

    • B. R. Horowitz

    Contributed Papers Pages: 411 - 416

12. Positron distribution in metals

    • P. Kubica
    • A. T. Stewart
    • M. J. Stott

    Contributed Papers Pages: 417 - 419

13. Absolute atomic densities determined by auger electron spectroscopy

    • P. Staib
    • J. Kirschner

    Contributed Papers Pages: 421 - 427

14. Wavelength stabilization of an Ar⁺ laser with an external¹²⁹I₂ absorption cell

    • F. Spieweck

    Letter Papers Pages: 429 - 430

15. Temperature dependence of hole saturation velocity in silicon

    • Toshiaki Ikoma
    • Kazuhiro Hara

    Letter Papers Pages: 431 - 432

16. The isotope effect of the impurity diffusion in electrotransport

    • Christian Herzig

    Letter Papers Pages: 433 - 434

17. Forthcoming papers

    Legacy Pages: 435 - 437

18. Book reviews

    • H. K. V. Lotsch
    • M. Schulz

    BookReview Pages: 438 - 438